No less than 18 mb inlet point

[Inverness]

I'm getting confused now... if Worcester says 14.5 mb at the inlet and the gas meter working pressure 19mb. From meter and gas inlet valve is greater than 2.5 mb drop.

 

[AWheating]

Think worcester say 16.5 mb. 19 at meter minus 1mb on pipe work minus 1.5 on gas line of appliance. 14.5 mb on sum ideals I believe.

In this situation always test hob on low flame and turn hot water/ boiler on full rate.

 

[johnduffell]

In this situation always test hob on low flame and turn hot water/ boiler on full rate.

Good idea, would be worth testing the hob with 3 rings on high and one on min, just to be on the safe side.

 

[Inverness]

I can't thank you guys enough for your helpful advise

 

[kasser]

To continue with this pipe-sizing thread, isn't it highly likely the pipework will be undersized if it is a 22 mm pipe from the meter feeding several appliances throughout the house?

I've just come across a house with the meter at the front and the boiler and hob at the back and the 22 mm pipe at meter was undersized by my calculations and also after measuring the pressure drop.

Another property I've seen was a meter at the front + 2 small fires + gas hob + gas oven + non-condensing boiler with a 22 mm pipe from the meter to feed all this. Kitchen & boiler were at the back. Thinking back now, this would have been severely undersized?

Last e.g: meter in outhouse, hob + boiler on 3rd floor flat, 22 mm pipe from meter to feed this. So if pipework was undersized in the first e.g, it's most likely going to be severely undersized here?

Yet you rarely see 28 mm pipe from the meter in houses.

 

[dween]

16.5 on pretty much all worcesters

 

[kris]

He's only got 4m of 22mm plus 4 bends so 6m of 22copper. Having 22mm copper gives you press absorb of 0.4mbar so absolutely fine for gas rate of 3.35m3 so you pressure drop must be @ gas valve / inlet .
But just thinking if you've a hob then your missing hob output and tee piece etc.
Inverness what's the total length of copper as Well as how many gas appliances etc